explain and dump not working with two UDFs inside inner plan of foreach

                 Key: PIG-1030
                 URL: https://issues.apache.org/jira/browse/PIG-1030
             Project: Pig
          Issue Type: Bug
            Reporter: Ying He

this scprit does not work

register /homes/yinghe/owl/string.jar;
a = load '/user/yinghe/a.txt' as (id, color);
b = group a all;
c = foreach b {
    d = distinct a.color;
    generate group, string.BagCount2(d), string.ColumnLen2(d, 0);

the udfs are regular, not algebraic.

then if I call  "dump c;" or "explain c", I would get  this error message.
ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2019: Expected to find plan with 
single leaf. Found 2 leaves.

The error only occurs forn the first time, after getting this error, if I call 
"dump c" or "explain c" again, it would succeed.

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